Manasara 34.37

34.37

teṣāṃ krameṇa vinyāsaṃ lakṣaṇaṃ vakṣyate'dhunā
caturaśrasamākāraṃ samamānaṃ tribhittikam

Their layout and characteristics will now be spoken of in order: / square in shape, of equal measure, with three walls;